So I just finished installing a set of m7 lowering springs and I'm noticing that when accelerating, the car feels "bumpy". This is only when accelerating and not when cruising at a constant speed. I've cut all the bump stops in half and am currently running my winter tires (185/65/15). An alignment was done as well. Is there a possibility that I've made a simple mistake in installation? Everything felt solid when putting back together... any help would be appreciated thanks!

 

I would double check everything but when using lowering springs you reduce the travel of your shocks/springs-

There is about 3.3" of droop travel and 1.7" of compression travel. If you are running stock shocks, adding a lowering spring that drops the car 1.0" puts the setup at 4.3" droop and 0.7" compression, which means big bumps bottom out the dampers and every little pebble in the road becomes a "bump".

 

too much drop for the cv axle .minis running h&r suspensions have had this problem .

 

and remember that's not including the bumpstop....

 

i know its not the springs because i've driven my friend's mini with the exact same springs on stock shocks and it rides perfectly.

after thinking about it a bit, i do remember having trouble torqueing the top nut on one of the front strut assemblies after putting new spring on. What i ended up doing was taking the impact gun to it for a verrry quick buzz but it ended up just spinning the whole steel actuator arm instead of the nut. could this have possibly damaged the strut in any way? thanks.

 

I can attest to this as well. I've had H&R lowering springs on my R56 for over 20K miles with no vibrations. The issue with the CV noise seems to happen if you lower the car over 2" and it only happens on some cars. My buddy's old R56 had KW V1s on it and lowered it 2.4" and had no vibration problems.